Fujifilm X-Pro2 Graphite with Fujinon 23mm f2 lens mount_Micro Four Thirds Leitz Extender-R 2x teleconverter for

Leitz Extender-R 2x teleconverter for R series SLR cameras in excellent condition

this one is such a viewfinder and should fit the bill

but you won't get infinity focus: this is mostly designed as an adjustable close-up tube

This particular example is the rarer version with index marks for Leica 7

The 30mm focal length makes this a slightly longer normal

Fujifilm X-Pro2 Graphite with Fujinon 23mm f2 lens mount_Micro Four Thirds Leitz Extender-R 2x teleconverter forThe Fujifilm X Pro2 is a profesional mirrorless camera with a 24mp X Trans sensor and a hybrid optical electronic viewfinder. Compatible with the full line of Fujinon XF lenses, the X Pro 2 provides speedy phase detect autofocus; for use with adapted classic lenses or in manual focus mode, there are several options for focus assist, including peaking and a nifty video inlay on the optical viewfinder. This Graphite X Pro2 is in excellent cosmetic